Power Supply; Battery Operation And Supply Voltage Monitoring; Mains Operation; External Dc Voltage Supply - Ahlborn ALMEMO 2590-2A Operating Instructions Manual

POWER SUPPLY

7.
Power can be supplied to the measuring instrument in any of the following ways :
3 AA alkaline batteries (included in delivery)
Mains adapter 12V, minimum 1A with ALMEMO
Electrically isolated power supply cable (10 to 30 VDC, 0.25 A)
USB Data Cable Supply (9V, 0.2A)
Our product spectrum includes all the appropriate accessories.

Battery operation and supply voltage monitoring

7.1
Power is supplied to the measuring instrument as delivered by 3 Alkaline-Mignon
batteries. At a current consumption of approx. 12 mA the operating time will be
approx. 200 hours. If the illumination is constantly switched on, this operating pe-
riod is reduced to approx. 60 hours. To prolong the operating time for the purposes
of long-term recording the device can be left in SLEEP mode; (see 12.5.8.2). The
operating voltage can be checked in the Info menu (see 10); this gives you a
basis for estimating the remaining operating time. As soon as the remaining bat-
tery capacity drops to approx. 10% the
display will start to flash. If the batteries are completely discharged, the device will
switch off at 3 V but measured data already acquired and the time-of-day will be
retained; (see 7.6). To replace old batteries first unscrew the battery compartment
cover (7) on the rear of the device.

Mains operation

7.2
To power the device from an external source preferably use the mains adapter
(ZA 1312-NAx) (12V/minimum 1A); connect this to the DC socket (3). Please
ensure that the mains voltage is correct. The sensor voltage rises to approx. 12
V.

External DC voltage supply

7.3
The DC socket (3) can also be used to connect another DC voltage, 6 to 13 V
(minimum 200 mA). This is connected via an ALMEMO
FS8). If, however, the power supply has to be electrically isolated from the trans-
ducers or if a larger input voltage range (10 to 30 V) is required, then electrically
isolated supply cable ZA 2690-UK must be used. It will then be possible to use
the measuring instrument in a 12-volt or 24-volt on-board supply system. As a
practical alternative, a USB data supply cable ZA 1919-DKUV is usable at the
same time an interface connects to the computer.

Sensor supply

7.4
At the terminals + (plus) and - (minus) in the ALMEMO
volt sensor supply voltage is available (self-healing fuse, total current 500 mA).
In the case of an external supply the voltage rises to 12 V. Other voltages (15,
or 24 V or references for a potentiometer and strain gauge) can also be obtained
using special connectors; (see Manual 4.2.5 and 4.2.6).
connector
®
¶
symbol in the status bar of the
® connector (ZA 1312-
® connector a 6.9 or 12-
ZA 1312-NAx
ZA 2690-UK
ZA-1919-DKUV
17